The Ajax EN54 Internal Battery (24h) is a rechargeable Li‑ion backup battery pack designed for use inside Ajax EN54 Fire Hub Jeweller and EN54 Fire ReX Jeweller control units. It provides up to 24 hours of autonomous operation in accordance with EN54‑4 requirements and is intended to be installed within the hub enclosure as a hot‑swappable internal backup.

• EN54‑compliant backup battery for EN54 Fire Hub Jeweller / EN54 Fire ReX Jeweller
• 24 hours autonomy (EN54‑4), nominal 7.4 V, 5 Ah capacity (4 × 18650 Li‑ion cells)
• Hot‑swappable inside the hub; charges in situ while main power present
• Compact, lightweight design for indoor use; tamper removal requires a special tool/key
• Manufacturer warranty: 24 months

Use cases: Suitable for installers and system integrators specifying EN54‑compliant backup for fire alarm control and indicating equipment (CIE). Ideal as a replacement or spare battery for Ajax EN54 hubs where 24‑hour autonomy is required.

Safety & installation notes: Install or replace the battery inside the hub enclosure only. A special removal tool/key is required for tamper‑protected housings. Observe standard lithium‑ion battery handling and disposal procedures. For correct installation, configuration and compliance with applicable regulations, follow the official Ajax EN54 Internal Battery manual and EN54 guidance. If in doubt, use a qualified installer.